[Telepathy] "This connection has no unique name yet"

[Benjamin M. Schwartz]

Often when I'm sending broadcast signals on a D-Bus Tube, I want to
respond only if the signal was not sent by myself.  To this end, it would
be convenient to cache my own "sender" identity.  I have tried to do so
using get_unique_name(), but if I call it too early I get

DbusException: This connection has no unique name yet

Is there documentation for when a connection acquires a name, and when it
is safe to call get_unique_name() ?

Thank you,
Ben Schwartz

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